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-rw-r--r--devices/serial_device.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/devices/serial_device.py b/devices/serial_device.py
index 53f9275..fe95dfe 100644
--- a/devices/serial_device.py
+++ b/devices/serial_device.py
@@ -265,8 +265,8 @@ class SerialDevice(BaseDevice):
self._fmt = fmt
self.simulate = simulate
self._num_channels = num_channels
- self._chan_names = channel_names
- self._units = units
+ self._chan_names = channel_names or self._chan_names
+ self._units = units or self._units
self._scpi_channels = scpi_channels or self._scpi_channels
self._slave_addr = slave_addr
self._parity = parity